Use the windows-gnu assembly files on x86_64 Cygwin too.
This fixes https://github.com/llvm/llvm-project/issues/54685.
|  Differential  D123187  
[Support] [BLAKE3] Fix building for Cygwin Authored by mstorsjo on Apr 6 2022, 12:15 AM. 
Details 
 Use the windows-gnu assembly files on x86_64 Cygwin too. This fixes https://github.com/llvm/llvm-project/issues/54685. 
Diff Detail 
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